diff --git a/cores/arduino/USB/USBCore.cpp b/cores/arduino/USB/USBCore.cpp
index 023cba8..2154fe5 100644
--- a/cores/arduino/USB/USBCore.cpp
+++ b/cores/arduino/USB/USBCore.cpp
@@ -877,6 +877,7 @@ bool USBDeviceClass::handleStandardSetup(USBSetup &setup)
 			sendZlp(0);
 			return true;
 		}
+		return false;
 
 	case SET_ADDRESS:
 		setAddress(setup.wValueL);